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NT5TU64M8EE Datasheet(PDF) 43 Page - Nanya Technology Corporation. |
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NT5TU64M8EE Datasheet(HTML) 43 Page - Nanya Technology Corporation. |
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43 / 96 page  DDR2 512Mb SDRAM NT5TU64M8EE / NT5TU32M16EG 43 Version 1.0 Nanya Technology Corp.© 09/2014 All Rights Reserved Refresh SDRAMs require a refresh of all rows in any rolling 64 ms interval. Each refresh is generated in one of two ways: by an explicit Auto-Refresh command, or by an internally timed event in Self-Refresh mode. Dividing the number of device rows into the rolling 64 ms interval defined the average refresh interval tREFI, which is a guideline to control for distributed refresh timing. Auto-Refresh Command Auto-Refresh is used during normal operation of the DDR2 SDRAMs. This command is non persistent, so it must be issued each time a refresh is required. The refresh addressing is generated by the internal refresh controller. This makes the address bits ”Don’t Care” during an Auto-Refresh command. The DDR2 SDRAM requires Auto-Refresh cycles at an average periodic interval of tREFI (maximum). When CS, RAS and CAS are held low and WE high at the rising edge of the clock, the chip enters the Auto-Refresh mode. All banks of the SDRAM must be precharged and idle for a minimum of the precharge time (tRP) before the Auto-Refresh Command can be applied. An internal address counter supplies the addresses during the refresh cycle. No control of the external address bus is required once this cycle has started. When the refresh cycle has completed, all banks of the SDRAM will be in the precharged (idle) state. A delay between the Auto-Refresh Command and the next Activate Command or subsequent Auto-Refresh Command must be greater than or equal to the Auto-Refresh cycle time (tRFC). To allow for improved efficiency in scheduling and switching between tasks, some flexibility in the absolute refresh interval is provided. A maximum of eight Auto-Refresh commands can be posted to any given DDR2 SDRAM, meaning that the maximum absolute interval between any Auto-Refresh command and the next Auto-Refresh command is 9 * tREFI. T0 T2 T1 T3 AR CK, CK CMD Precharge > = t RP NOP AUTO REFRESH ANY NOP > = t RFC > = t RFC AUTO REFRESH NOP NOP NOP CKE "high" |
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